Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c64ef48b9ecc79…

MALICIOUS

PDF

188.1 KB Created: 2021-06-25 14:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 73474e16f90ba30d6b8d744e67c31c5d SHA-1: 1c9a70e35172c14408797ee86d2e3b9670988bfa SHA-256: f2c64ef48b9ecc791d3a3a4e486528de69563ea10a2a69ab4746ef45dd92b6a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and the link farm detection further support this, suggesting the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=like+the+sun+that+rises+everyday PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/xolozamofip.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9636b95ed23552a705999c2034ffb848/72251983758.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5f3d43ad---wukimevi.pdfIn PDF document text
    • https://motacademy.it/file/goxepaw.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/909b94674cc648cad2ec7439f8ce08f9/sakabazeniwo.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/jogudukoviduridefokaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2381754beb---fuvolevitigam.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/relonibifopajipulum.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/h1aslg1ojv4imjkb8f8v6d35t6/95029473721.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064a75d5ff---kelugovukevusosidu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/38c3fae6f17a13d4ccfc2372bed2f269/talifuwasokumovevomogaj.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/v5te80dfs0ntdunq5to07tf1h2/kovilajiwe.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/82881086181.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224c307f36---bexukurezulapifazoliguke.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/pekuvedawitonosu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E00 19524 bytes
SHA-256: 6c138bfb62451abc3ea2b4fe78fb818e30f31411e7bec88d483ec6ad45a8d076
font_01_sfnt_off00027f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000297a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297A0 10508 bytes
SHA-256: 05a562a13fa5937095e1ddc36b64e176ec56d17c8ac89a3089796146c1412368
font_03_sfnt_off0002af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF87 20660 bytes
SHA-256: 211003e4cee4e267a925ebba6f5c976194be422ae0b3179a6a0d88825e1c0453